Hoisting apparatus



(No Model.) A 3 sheets-sheet 1.

A DE WITT G. PRESCOTT.

HOISTING. APPARATUS.

Patented Mar; 3, 1885.

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(No-Model.) 3 SheetsSheet- 2..

DE WITT C. PRESCOTT.

HOISTING APPARATUS. No. 313,104. Patented Mar. 3, I885.

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DE WITT'C. PRESCOTT.-

HOISTING APPARATUS.

N0. 313,104. Patented Mar. 3 1885..

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Marinette,in the county of Marinette and State Unrrnn Sterne Parent Oriana.

DE \VITT CLINTON PRESCOTT, OF MARINETTE, WISCONSIN, ASSIGNOR TO THE MARIN ETTE IRON WORKS COMPANY, OF SAME PLACE, AND MAXIMILIAN JAOKER', OF FLORENCE, NVISCONSIN.

HOISTING APPARATUS;

SPECIFICATION forming part of Letters Patent No.313,10t, dated March a, 1885.

Application filed July 14, 1884. (No model.)

To all whom it may concern:

Be it known that 1, DE WIN 0. Pnnsoo'r'r, a citizen of the United States, and residing at of \Visconsin, have invented certain new and useful Improvements in Hoisting Apparatus, which are fully set forth in the following specification, reference being had to the accompanying drawings, in which Figure 1 is a plafi view of a machine embodying my invention. Fig. 2 is a sectional view on the line a: w of Fig. 1, looking toward Fig. 3 is a sectional view on the line y y of Fig. 1, looking toward the main drive-wheel. Fig. 4 is a vertical central sectional view, partly in elevation. Fig. 5 is a sectional view on the line 2 e of Fig. 4.; and Figs, 6, 7, and 8 are detail views.

My invention relates to hoisting-machines which are intended for heavy work, and especially such as are used at mines for hoisting ore, though not intended to be limited to masists in an improvement upon the machine patented to Maximilian J'acker, July 1, 188i, No. 301,125, the novel features of which will be hereinafter described, and then specifically pointed out in the claims.

In the above -1nentioned machine a main frame, A, is provided with suitable boxes to receive the main driving-shaft'B,which is suitably connected with the engine or other mo- A pinion, b, is keyed on the main shaft at a suitable point to engage with the main wheel D of the drum. The drum O is mounted loosely on a shaft, 0, running in suitable boxes, a, on the frame A, this shaft being parallel with the main shaft. On this shaft 0 the main wheel D is keyed or otherwise secured. A friction-wheel, E, is made fast to one end of the drum in any suitable manner, but of course is loose on the drum shaft. This frictionwheel is surrounded by a suitable frictionband, 6, the friction-wheel and its hand being next to the driving-wheel. A'short shaft, F, (which may be called the lever-shaft,) is mounted in the main wheel, through which it extends from side to side. This shaft is in- 5 of the drawings.

- bell-crank,

closed in a sleeve or thiinble, F, which is secured in the wheel,and projects a little beyond theinner face thereof, as shown in Figs. 4 and On the inside of the main wheel one end of the friction-band is fastened directly to the inner end of the sleeve F by means of a collar, 6, passing around it, as 5 shown in Figs. 4 and 5 of the drawings. On the inner end of the lever-shaft is a short arm,

f, fastened to it in any suitable way. The other end of the friction-band is secured to the outer end of this short arm f'inany suitable way. In the drawings it is shown as fastened to the arm by passing the end 6 through the arm, and securing it in position by nuts 0 on each side thereof, which not only fasten the band to the arm, but also afford means for adjusting its length within certain limits.

It is obvious that the oscillation of thelevershaft will vibrate the short arm on the inner end thereof, which movement will tighten or loosen the frictioirband on the wheel, and thereby connect or disconnect the drum and its drive-wheel.

My improvement relates, especially, to an improved mechanism for oscillating this lever, whereby I provide a simplified and efficient de- 7 5 vice for the purpose, which is easy to construct, its parts being simple in construction and readily put together or taken apart for repairs, and which acts powerfully and positively upon the friction-band to tighten, it. To this endl attach to the outer end of the lever-shaft Fin any suitable manner a crank-arm. G, which is connected by a suitable pitinan to a bell-crank: lever, H, mounted on the drive-wheel D.

Fig. 6 shows an end view of thelevershaft, inner arm, and crank-arm G. In the drawings this bell-crank lever is shown as pivoted on an arm, h, bolted to the hub, and the pitman is shown as pivoted at each'end to a block,

g, which is in turn pivoted by gudgeons at 90.

right angles to the pivot-bolt of the pitman, between the forked ends of the crank-arm and The other end of the bell-crank lever enters a groove, 2', in a sleeve, I, splined and capable of longitudinal lllOVGlllEllllOIl the drum-shaft 0, so as to operate the bell-crank eration of the device. I prefer to pivot the ends of the bell-crank lever which enter the groove 4; to blocks 11, which fit the said groove, and cause the device to operate smoothly and immediately.

In order to operate the sleeve I on the shaft 0, I provide in the said sleeveasecond groove, j, in which setsa half collar or yoke, J, (shown in detail in Fig. 8,) which yoke is pivoted to two crank-arms, 70, secured on a rock-shaft mounted in suitable bearings on frame A, and

provided with suitable means for rocking the same. In the construction shown the rockshaft is operated by means of a crank-arm, is, secured thereto, and having pivoted in its outer forked end a nut, Z, through which is passed a screw-threaded shaft, L, provided at its up per end with a hand-wheel, L, and swiveled at its lower end in a hinged bracket, M, as shown. It is evident that the rotation ofshaft L will raise or lower the end of crank-arm k, and thereby oscillate the rock-shaft K, and, by means of the intervening connecting mechanism, tighten or loosen the friction band. The hoisting-drum is also provided with an ordinary brake-wheel, N, arranged just inside of the hoisting friction-wheehto .which is applied a friction brake-band, O, operated in any usual way. In the drawings I have shown a shaft, 0, provided with a hand-wheel, 0, which has a threaded section arranged to 0pcrate in a well-known way to draw together or separate the ends of the brake-band, for the purpose of applying it to the brake-wheel or releasing it therefrom in the usual way. The brake hand-wheel 0 is arranged near the handwheel L, so as to be readily reached by the attendant, and when the hoisting is completed a few turns of the hand-wheel L will ease the friction-band sufficiently to permit it to slip, and the drum will stop, when the attendant may at once' apply the brake-band to hold the drum firmly in place, and then the driving friction may be further released at will.

It will be seen that my mechanism for operating the lever-shaft is all open for constant inspection, and any part thereof can be reached without removing it or other parts; and, further, that it is noiseless, no gear-wheels being employed, on which account, also, there is no lost motion owing to backlash.

I do not wish to be understood as confining myself to all the details. of construction, as above described, as they may be modified in many particulars without departing from the principal features of my invention.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a machine of the character described, the combination, with the lever shaft and the devices operated thereby, of a pitman connected with a bell-crank lever engaging an adjustable sleeve on the drum-shaft, substantially as and for the purpose specified.

*2. In a hoistingmachine, a drive-wheel fixed to the drum-shaft, a drum loose on said shaft, a friction-wheel attached to said drum, and a friction-band thereon attached 'to and carried by the drive-wheel, in combination with a lever-shaft mounted in the drive-Wheel, and having an inner arm to tighten and loosen the friction-band, and an outer arm connected by a pitman with a bell'crank lever mounted on the drive-wheel, and engaging an adjustable sleeve on the drum-shaft, substantially as and for the purpose set forth.

3. 'In a machine of the character described, the combination, with the lever-shafts and the devices operated thereby, of pitman-rods connected with bell-crank levers on the drivewheel engaging a sleeve splined on the drum shaft and grooved to receive a yoke connected with the arms of a rock-shaft for adjusting the said sleeve on the drumshat't, substantially as and for the purpose specified.

4. The coi'nbination, in a hoisting-machine, of the rock-shaft K, having the arm 70, carrying the nut Z, and the threaded shaft L, having handwheel L, and swiveled in the hinged bracket M, substantially as and for the purpose set forth.

5. In a hoisting-machine, the combination of a drive-wheel fixed to the drum-shaft, a drum loose on said shaft, a friction-wheel attached to the drum, a friction-band thereon attached to and, carried by the drive-wheel, and lever-shafts mounted in the drive-wheel, and having each an inner arm to tighten and loosen the friction-band, and an outer arm connected by a pitman with one arm of a bellcrank lever the other arm of which enters a groove in a sleeve splined on the drum-shaft, and having another groove to receive a yoke pivoted to the crank-arms of a rock-shaft,having another arm carrying a nut traveling on a screw-shaft provided with a hand-wheel and swiveled in a hinged bracket, substantially as and for the purpose specified.

DE WITT CLINTON PRESCOTT.

Witnesses:

A. M. BEST, W. O. JoRLIEs. 

